| abstract |
A metallocene compound of formula (I): wherein M is zirconium, titanium and hafnium; X is a hydrogen atom, a halogen atom or a hydrocarbon radical; R 1 is a linear C 1 -C 20 -alkyl radical; R 2 is a hydrogen atom or hydrocarbon R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 , are hydrogen atoms or hydrocarbon radicals, A is a sulphur (S) atom or an oxygen (O) atom; Q is a radical of formula (II), (III) or (IV) being bonded to the indenyl at the position indicated by the symbol *; (II), (III), (IV) wherein T 1 is a sulphur atom, an oxygen (O) atom or a NR; R 9 , R 10 and R 11 are hydrogen atoms or hydrocarbon radicals; T 2 , T 3 , T 4 , T 5 , and T 6 are carbon atoms (C) or nitrogen atoms (N); m 1 , m 2 , m 3 , m 4 and m 5 are 0 or 1; R 12 , R 13 , R 14 , R 15 and R 16 are hydrogen atoms or hydrocarbon radicals with the provisos that at least one of R 12 , R 13 , R 14 , R 15 and R 16 is different from hydrogen atoms, and that no more than two of T 2 , T 3 , T 4 , T 5 and T 6 are nitrogen atoms. |